Congenital Melanocytic Nevi



Congenital Melanocytic Nevi


Christine J. Ko, MD










This light tan, medium-sized congenital melanocytic nevus, 10 × 8 cm, has coarse terminal hairs within it. The patient also has keratosis pilaris image and an acquired melanocytic nevus image.






This congenital nevus has nests of larger, heavily pigmented superficial cells image progressing to small nonpigmented cells deeper in the dermis image, consistent with maturation with dermal descent.


TERMINOLOGY


Synonyms



  • Giant/bathing suit/garment-type melanocytic nevus


CLINICAL ISSUES


Epidemiology



  • Incidence



    • 1% of newborns


  • Age



    • Present at birth, by definition


    • However, some congenital melanocytic nevi may be “tardive”



      • Not readily noticeable at birth; becomes more obvious with age (generally by age 2)

Jul 8, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Congenital Melanocytic Nevi

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